题解 | #查找兄弟单词#

import sys

while 1:
    try:
        d=list(input().split(" "))
        nn=int(d[0])
        n=len(d)
        x=d[n-2]
        dijige=d[n-1]
        xiongdi=[]
        for i in range(1,nn+1):
            a=d[2]
            if d[i]!=x and sorted(str(x))==sorted(str(d[i])):
                xiongdi.append(d[i])                               
            else:
                continue
        print(len(xiongdi))

        print(sorted(xiongdi)[int(dijige)-1])
    except:
        break